Remove migratecheckpoint command

[dmitryax]

The migratecheckpoint command is no longer needed following the deprecation of the fluentd sidecar in signalfx/splunk-otel-collector-chart#2138

[Copilot]

Pull Request Overview

This PR removes the migratecheckpoint command and related files following the deprecation of the fluentd sidecar. The migration tool is no longer needed since users are no longer transitioning from fluentd to the OpenTelemetry Collector.

Key changes:

• Removed the entire migratecheckpoint command implementation and tests
• Updated build scripts and CI/CD configurations to exclude migratecheckpoint binary generation
• Removed documentation references to the migration tool

Reviewed Changes

Copilot reviewed 11 out of 14 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
cmd/migratecheckpoint/main.go	Removed main implementation of the checkpoint migration tool
cmd/migratecheckpoint/main_test.go	Removed test cases for checkpoint migration functionality
cmd/migratecheckpoint/log_library.go	Removed supporting library code for log file operations
cmd/migratecheckpoint/filestorage.go	Removed file storage client implementation
cmd/migratecheckpoint/README.md	Removed documentation for the migration tool
docs/deprecations/fluentd-support.md	Removed references to the migration tool from deprecation documentation
cmd/otelcol/Dockerfile	Removed migratecheckpoint binary from Docker image
packaging/docker-otelcol.sh	Removed migratecheckpoint from build artifacts list
Makefile	Removed migratecheckpoint build targets and commands
.gitlab-ci.yml	Removed migratecheckpoint artifacts from CI pipeline
.chloggen/remove-migratecheckpoint.yaml	Added changelog entry documenting the breaking change

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 37.95%. Comparing base (2339b2c) to head (47a7bd6).

❌ Your project check has failed because the head coverage (37.95%) is below the target coverage (40.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6881      +/-   ##
==========================================
+ Coverage   37.78%   37.95%   +0.16%     
==========================================
  Files         370      367       -3     
  Lines       25925    25739     -186     
==========================================
- Hits         9797     9770      -27     
+ Misses      15308    15159     -149     
+ Partials      820      810      -10     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[Copilot]

Pull Request Overview

Copilot reviewed 12 out of 15 changed files in this pull request and generated no new comments.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[crobert-1]

🎉